F-1 has to do with sediment in the bottom of your tub or a loose water pressure hose or a hole in that hose. It is an easy fix with no parts needed. What you do is remove the small hose that connects to the water pressure switch. Blow through it to unclog any sediment in the base of the tub. Re-attach the hose and pump out any water to allow for pressure to build once more in that tubing so them fancy lectroncs won't have a cow.
I have photos manual and directions HERE
If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61
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